[rrd-users] A reason there isn't a CF SUM function?

[Derek Haynes]

> That makes sense. You will only get one value by summing a list of numbers.
> Which leads on to ... what would you store for a SUM CF ?

Instead of averaging the known values, calculate the sum. For example,
if I have an RRD file w/1-min RRAs and I want to fetch at a 30-minute
step (lower resolution across a large time frame), I'd be looking for
the sum of each RRA value during each 30 minute interval.

-Derek

On Tue, Aug 21, 2012 at 9:55 AM, Simon Hobson <linux at thehobsons.co.uk> wrote:
> Derek Haynes wrote:
>
>>For reason (1), the common argument is you can calculate this by
>>multiplying the average by the duration of the CDP. However, this
>>doesn't hold when a CDP contains unknowns as the average is only based
>>on the known values.
>
> And the same would apply if you had a SUM CF
>
>>The TOTAL operator does exactly what I'm looking for but it's only for
>>VDEF statements.
>
> That makes sense. You will only get one value by summing a list of numbers.
> Which leads on to ... what would you store for a SUM CF ?
>
> --
> Simon Hobson
>
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Derek Haynes
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